Table 4 Comparison of thyroid hormones between our study from Sudan and previous reports from other countries
From: Trimester-specific thyroid hormone reference ranges in Sudanese women
Percentile used | TFT | Non-pregnant | Trimester I | Trimester II | Trimester III | |
|---|---|---|---|---|---|---|
Sudan | 5–95 | TSH, IU/ml | 0.78–4.55 | 0.08–2.18 | 0.54–2.52 | 0.59–2.46 |
T3, nmol/L | 4.16–6.10 | 3.84–6.56 | 3.43–5.45 | 3.18–5.16 | ||
T4, pmol/L | 12.6–20.0 | 13.00–31.53 | 11.07–31.2 | 9.78–23.81 | ||
Nigeria [20] | 5–95 | TSH, IU/ml | – | 0.5–5.0 | 0.5–5.0 | 0.5–5.0 |
T3, nmol/L | – | 1.7–3.5 | 1.86–3.54 | 1.9–3.94 | ||
T4, pmol/L | – | 6.1–19.7 | 8.5–23.3 | 8.9–23.3 | ||
UAE [5] | 2.5–97.5 | TSH, IU/ml | 0.21–6.9 | 0.17–5.9 | 0.04–9.3 | 0.3–4.32 |
T3, nmol/L | – | – | – | – | ||
T4, pmol/L | 8–18 | 8.4–19.3 | 8.9–24.6 | 9.8–18.6 | ||
Iran [6] | 5–95 | TSH, IU/ml | – | 0.2–3.9 | 0.5–4.1 | 0.6–4.1 |
T3, nmol/L | – | – | – | – | ||
T4, pmol/L | – | 8.5–19 | 9.7–21 | 8.7–20.4. | ||
Turkey [9] | 2.5–97.5 | TSH, IU/ml | 0.47–4.70 | 0.49–2.33 | 0.51–3.44 | 0.58–4.31 |
T3, nmol/L | 2.96–5.48 | 3.80–5.81 | 3.69–5.90 | 3.67–5.81 | ||
T4, pmol/L | 10.68–18.23 | 10.30–18.11 | 10.30–18.15 | 10.30–17.89 | ||
Switzerland [3] | 2.5–97.5 | TSH, IU/ml | 0.35–4.94 | 0.06–2.83 | 0.20–2.79 | 0.31–2.90 |
T3, nmol/L | – | 3.52–6.22 | 3.41–5.78 | 3.33–5.59 | ||
T4, pmol/L | 9–19.1 | 10.5–18.3 | 9.5–15.7 | 8.6–13.6 | ||
Spain [10] | 2.5–97.5 | TSH, IU/ml | – | 0.10–2.65 | 0.12–2.64 | 0.23–3.56 |
T3, nmol/L | – | 3.44–6.80 | 3.79–6.42 | 3.46–6.39 | ||
T4, pmol/L | – | 10.61–17.76 | 9.1–14.67 | 8.49–15.6 | ||
India [7] | 5–95 | TSH, IU/ml | – | 0.6–5.0 | 0.43–5.78 | 0.74–5.7 |
T3, nmol/L | – | 1.92–5.86 | 3.2–5.7 | 3.3–5.18 | ||
T4, pmol/L | – | 12.0–19.45 | 9.48–19.58 | 11.3–17.71 | ||
China [8] | 2.5–97.5 | TSH, IU/ml | 0.54–4.20 | 0.16–3.78 | 0.34–3.51 | 0.34–4.32 |
T3, nmol/L | – | 2.9–5.0 | 2.9–4.6 | 2.9–4.5 | ||
T4, pmol/L | 9.2–16.9 | 10.9–17.7 | 9.3–15.2 | 7.9–14.1 | ||
USA [4] | 2.5–97.5 | TSH, IU/ml | – | 0.24–2.99 | 0.46–2.95 | 0.43–2.78 |
T3, nmol/L | – | – | – | – | ||
T4, pmol/L | – | – | – | – |